ES2923013T3 - Bearing arrangement in a worm wheel planetary gear - Google Patents

Abstract

The present invention relates to a bearing arrangement for mounting a worm gear shaft (12) of a worm planetary gear (14), in particular for an adjustment device in vehicles for adjusting two vehicle parts that can be adjusted to one another. yes, the worm gear planetary gear (14) having a worm gear shaft (12) with worm gear teeth (24), which is rotatably mounted around a worm gear shaft shaft (AS), and comprises a planetary carrier (34) with at least three helical planetary gears (36), each of which is rotatably mounted around a planetary gear shaft (AP) on the planet carrier (34) and each of which has one toothed planetary gear (38), the planetary gear shafts of worm gear (AP) rotate obliquely to the worm gear shaft shaft (AS), and the bearing arrangement (10) to support the worm gear shaft (12) It has a first bearing section (32) and a second bearing section (40), wherein the first storage section (32) of an axial and radial bearing (26) and the second item storage section (40) are formed by the helical planetary gears (36), the planetary gear teeth (38) in the second storage section (40) being engaged with the worm gear teeth (24). Furthermore, the invention relates to a helical planetary gear, in particular for an adjustment device in vehicles for adjusting two mutually adjustable vehicle parts, which has such a bearing arrangement. Furthermore, the invention relates to a motor and gear arrangement with an electric motor and such a helical planetary gear. Furthermore, the invention relates to a method for producing this storage device. (Automatic translation with Google Translate, without legal value)

Description

DESCRIPTION

Bearing arrangement in a worm wheel planetary gear

The present invention relates to a motorized gear arrangement with an electric motor and a planetary worm gear, in particular, for an adjustment device in vehicles for adjusting two mutually adjustable vehicle parts. Furthermore, the invention relates to a method for producing a mounting arrangement for mounting a worm wheel shaft of a worm wheel planetary gear, in particular, for an adjusting device in vehicles for adjusting two mutually adjustable vehicle parts.

Planetary gears are used in many drive trains as they allow for large gear ratios or reductions in a small space. A field of application is represented by auxiliary drives for automobiles, with which two mutually adjustable vehicle parts can be moved in relation to one another. An example of such auxiliary drives are electromechanical actuator arrangements, which are used, among other things, to actuate automobile parking brakes. Other auxiliary drives are used, for example, for longitudinal seat adjustments, tailgate adjustments, power windows and sunroof adjustments. Since the space available in automobiles is fairly dimensioned, planetary gears can unfold their advantages particularly well in this case.

In auxiliary drives almost without exception electric motors are used as the drive source. Normally used electric motors frequently rotate with a comparatively high number of revolutions, so that high gear ratios are necessary in order to be able to adjust the vehicle parts with the desired, comparatively slow movement in relation to one another. In addition, the torques emitted by the electric motor are often not sufficient to be able to move the vehicle parts, so that gear ratios are necessary for this, too.

Also while known planetary gears can provide high gear ratios, in some fields of application these are not sufficient, so that it is forced to use two-stage or multi-stage gears, in which two or more planetary gears are arranged. in the drive train. This increases the complexity of the drive train, whereby compared to a single-stage worm wheel planetary gear, manufacturing is complicated, the probability of failure is increased, and the construction space is increased.

One possibility to increase the multiplication or reduction ratios of planetary gears lies in the use of so-called "coaxial gears". The gear wheels of conventional planetary gears are configured as spur wheels. In coaxial gears, the main gear is configured as a worm gear and the satellite gears are configured with a correspondingly adapted satellite gear toothing. The inner wheel has an internal toothing corresponding to the satellite wheel toothing.

A particularly striking feature of such coaxial gears is the fact that the planet gear axes do not run parallel to the axis of rotation of the worm, but rather at an angle with respect to it. At least in this sense the term "coaxial gear" is not accurate, so such gears will be referred to below as planetary worm gears. Such planetary worm gears are disclosed, for example, in US 4 777 847 A, WO 2015/036328 A1 and EP 2166252 A1. In addition to high gear ratios, such planetary worm gears provide quiet running behavior with low noise development.

DE 19928385 A1 discloses a planetary gear, in which the planet gear axes run in one plane with respect to, but form an angle with, the axis of rotation of the main wheel, so that the gear axes satellite do not run parallel to the axis of rotation of the main wheel. The main wheel is configured as a bevel wheel and not as a worm wheel.

Although this type of planetary gears provide high multiplication or reduction ratios with reduced noise development, they have the property that high axial forces act on the worm and the inner wheel, which depending on the direction of rotation are directed in one direction. or the opposite. These axial forces acting as a function of the direction of rotation are used in EP 2166252 A1 for an axial displacement, for example, of the inner wheel, to thereby lock the worm wheel planetary gear shown therein for a direction. spin and provide a kind of self-inhibition. In this sense, in EP 2 166252 A1 no special preventive measures are taken to absorb the acting axial forces. In WO 2015/036328 A1, the shaft, on which the worm is arranged, is mounted with two bearings on one side of the worm in each case inside the planet carrier. In this way, on the one hand, a certain construction space is required and, on the other hand, assembly is complicated.

Therefore, the aim of an embodiment of the present invention is to indicate a gear arrangement in particular for an adjusting device in vehicles for adjusting two mutually adjustable vehicle parts, with which the aforementioned disadvantages can be remedied. In particular, the motor gear arrangement is intended to make it possible, in comparison with the known planetary gears with worm gear shafts running at an angle to the worm wheel shaft axis, to reduce the required construction space and to simplify the installation. mounting.

This object is achieved with the features indicated in claims 1 and 3. Advantageous embodiments are the subject of the dependent claims.

An embodiment of a mounting arrangement that is used in a motor gear arrangement for mounting a worm wheel shaft of a worm wheel planetary gear. in particular, for an adjusting device in vehicles for adjusting two mutually adjustable vehicle parts, it is designed in such a way that the worm wheel planetary gear comprises a worm wheel shaft with a worm wheel toothing, which is rotatably mounted around of a worm-wheel shaft axis, and a planet carrier with at least three worm-wheel planet wheels, which are each rotatably mounted about a planet-wheel axis on the planet carrier and each have a planetary gear toothing, the worm gear axes running at an angle relative to the worm gear shaft axis, and the mounting arrangement for mounting the worm gear shaft having a first mounting section and a second mounting section mounting, the first mounting section being arranged outside the planet carrier and being formed by an axial and radial bearing, and being the second mounting section formed by the worm wheel planet wheels, the planet wheel toothing in the second mounting section being in mesh with the worm wheel toothing. A worm wheel shaft is to be understood as a rotatably mounted component with the mounting arrangement, which has a worm gear toothing. The worm wheel shaft must be able to be driven, in particular, by a motor shaft.

The present invention relates to worm wheel planetary gears and not to worm planetary gears as disclosed in WO 2015/036328 A1 and EP 2166252 A1. However, worm wheel planetary gears are very similar to worm planetary gears. Whereas in worm wheel planetary gears in the worm wheel there is a pinpoint contact with the worm wheel planetary gears, which in the case of load becomes a so-called pressure ellipse, in a worm planetary gear due to the globe shape of the toothed section of the worm gear and there is line contact to the satellite wheels. In both types of planetary gears, however, high axial forces act on the worm shaft or the worm wheel shaft.

Since the first mounting section of the proposed mounting arrangement of the worm wheel shaft is formed by an axial and radial bearing, the acting axial forces can be completely or substantially completely absorbed by the first mounting section. The second mounting section is formed by the worm gears, which are designed in such a way that they provide particularly good radial guidance of the worm gear shaft in the area of the worm gear toothing. Also the use of at least three worm wheel satellite wheels contributes to the good radial guidance of the worm wheel shaft in the second mounting section. Consequently, unlike the mounting arrangement shown in WO 2015/036328 A1, a second axial and radial bearing can be dispensed with. In this way, on the one hand, the axial construction space is reduced, on the other hand, the mounting of the proposed mounting arrangement is simplified. The mounting is furthermore simplified compared to the mounting arrangement shown in WO 2015/036328 A1 also in that the axial and radial bearing is arranged outside the planet carrier. Since the number of components is reduced, the costs of the mounting arrangement as proposed can also be reduced compared to known mounting arrangements. Furthermore, the reduction in the number of components results in a decrease in the probability of failure of the mounting arrangement.

It has been found that a particularly good mounting of the worm gear shaft in the second mounting section can be achieved in the areas indicated for the crown as well as for the profile covers, which leads to smooth running behavior with a reduced noise. Profile coverage indicates how many pairs of teeth are statistically in mesh at the same time. In order to guarantee a continuous transmission of the torque, the degree of coverage must be at least 1. When the value of the degree of coverage is between 1 and 2, a continuous transmission of the torque can be guaranteed.

In an improved embodiment of the mounting arrangement used in a gear arrangement, the worm wheel shaft may have a first end and a second end and the worm gear toothing extends to the second end. The manufacture of the worm wheel shaft can be simplified since it is not necessary to extend the worm wheel shaft beyond the worm wheel toothing to the second end. A tool for making the worm wheel gear can be applied directly to the worm wheel shaft. Recesses or similar measures for the exit of the tool are not necessary. Furthermore, the worm wheel shaft can have a comparatively short axial extension, so that material and weight can be saved.

According to an improved embodiment of the mounting arrangement used in a gear arrangement, the worm wheel shaft may have a first end and a second end, the worm wheel toothing forming a free end pointing to the second end and comprising the worm wheel shaft between the second end and the free end a cylindrical section. The cylindrical section serves, in particular, to receive the worm wheel shaft during assembly. Furthermore, providing the cylindrical section has advantages for reasons of measurement technology.

In a further embodiment of the mounting arrangement used in a gear arrangement, the axial and radial bearing can be formed by a roller bearing and in particular by a ball bearing. Roller bearings and, in particular, ball bearings can also absorb comparatively high axial forces and at the same time provide radial guidance. Consequently, the axial and radial bearing can be implemented with one component, whereby assembly is simplified and the number of components is kept small. Ball bearings represent a particularly economical bearing, for absorbing both axial and radial forces.

In one embodiment of a gear arrangement, a worm wheel planetary gear is used, in particular for an adjusting device in vehicles for adjusting two mutually adjustable vehicle parts, comprising a worm wheel shaft with a worm wheel toothing , which is rotatably mounted about a worm-wheel shaft axis, a planet carrier with at least three worm-wheel planet wheels, which are each mounted rotatably about a planet-wheel axis on the planet carrier and each have a worm gear toothing, the worm gear axes running at an angle relative to the worm gear shaft axis, an inner worm gear with an inner toothing, which meshes with the gearing planet gear, and a mounting arrangement for mounting the worm wheel shaft according to one of the above embodiments.

One embodiment of the invention relates to a motorized gear arrangement, in particular, for an adjustment device in vehicles for adjusting two mutually adjustable vehicle parts according to claim 1.

The technical effects and advantages, which can be achieved with the worm wheel planetary gear as proposed and the motor gear arrangement as proposed, correspond to those which have been explained for the present mounting arrangement. In summary, it should be noted that, unlike the worm wheel planetary gear shown in WO 2015/036328 A1, a second axial and radial bearing can be dispensed with. In this way, on the one hand, the axial construction space is reduced, on the other hand, the mounting of the proposed mounting arrangement is simplified.

In addition, the following technical effect is obtained for the motor gear arrangement: The mounting arrangement is configured in such a way that it absorbs the acting axial forces completely or almost completely. Consequently, no or only low axial forces act on the motor shaft, so that the mounting of the motor shaft does not have to be adapted. Consequently, practically any electric motor can be used without notable constructional variations for the motor-gear arrangement described herein, whereby it can be used for a large field of application.

In an embodiment of the motor gear arrangement according to the invention, the axial and radial bearings are arranged in a bearing housing, which is arranged between the electric motor and the internal worm wheel and is connected to the motor in a non-rotating manner. electric and internal worm wheel. With the bearing housing, in particular, the axial forces acting on the gear-to-motor arrangement can be introduced so that, in particular, the motor shaft is not loaded axially or only to a small extent. Damage to the motor shaft mounting as a result of excessive stress due to the acting axial forces is prevented particularly effectively with the bearing housing. The arrangement of the axial and radial bearing between the electric motor and the internal worm wheel makes it possible to arrange the axial and radial bearing outside the planet carrier, thereby simplifying the assembly of the gear-to-motor arrangement, for example, compared to a conventional arrangement. motor gear disclosed in WO 2015/036328 A1.

A further embodiment is characterized in that the internal worm wheel is connected to the electric motor in a non-rotating manner. In general, it is easier to fasten the inner worm wheel in a rotation-resistant manner to the electric motor than to connect the axially fixed but rotatable inner worm wheel to the electric motor. Furthermore, the motor gear arrangement does not have any rotating parts on the outside, since the internal worm wheel surrounds the rotating planet carrier, whereby the safety during operation of the motor gear arrangement can be increased.

An implementation of the invention relates to a method for producing a bearing arrangement for mounting a worm wheel shaft of a worm wheel planetary gear, in particular for an adjusting device in vehicles for adjusting two mutually adjustable vehicle parts , which includes the following stages:

- providing a worm wheel shaft with a first end, a second end and a worm wheel toothing,

- providing a first mounting section by means of an axial and radial bearing,

- arranging the axial and radial bearing in a bearing housing, which is injected around the axial and radial bearing,

- provide a planet carrier with at least three worm gears, each of which is rotatably mounted about a planet gear axis on the planet carrier and each has a planet gear toothing, running the worm wheel sunwheel shafts inclined relative to the worm wheel shaft axis and the sunwheels forming a second mounting section,

- insert the worm wheel shaft into the first mounting section with the first end, and

- inserting the worm wheel shaft into the second mounting section with the second end in such a way that the planet gears are engaged in the second mounting section with the worm wheel toothing.

The effects and technical advantages, which can be achieved with the method as proposed, correspond to those which have been explained for the present mounting arrangement. In summary, it should be noted that a second axial and radial bearing can be dispensed with. In this way, on the one hand, the axial construction space is reduced, on the other hand, the mounting of the proposed mounting arrangement is simplified.

After removal of the bearing housing from a correspondingly configured injection molding tool, there is a unit from the bearing housing and the axial and radial bearing, without an assembly step being necessary to hold the axial and radial bearing in the housing of bearing. Consequently, assembly is simplified.

Furthermore, a variant of the invention relates to the use of a worm wheel planetary gear according to one of the configurations explained above and to the use of a motor gear arrangement according to one of the configurations explained above for gate arrangements. Such tailgate arrangements relate in particular to automobile tailgates. Motor-driven gear arrangements, which are used in connection with actuated tailgate arrangements, are subject to a number of limitations, in particular with regard to the available construction space, which in particular lead to the fact that, on the one hand, they have to Relatively complex and thus expensive drive solutions can be selected and, on the other hand, a high risk can occur that the gear jams as a result of the acting forces, which moreover can still vary depending on the position of the gate. The motor gear arrangement as proposed and the planetary worm gear as proposed meet these requirements to a particular extent, since, in particular, they require a short axial installation space and have a low tendency to jam.

Exemplary embodiments of the invention are explained in more detail below with reference to the accompanying drawings. show

FIG. 1a) an exemplary embodiment of a mounting arrangement as proposed by means of a perspective view,

FIG. 1b) the exemplary embodiment shown in FIG. 1a) in partial sectional representation from the side, in each case in the unassembled state,

FIG. 1c) the exemplary embodiment shown in FIG. 1a) in partial sectional representation from the side in the assembled state,

Fig. 2 to Fig. 7 different mounting steps for producing a motor gear arrangement as proposed, featuring a worm wheel planetary gear with the mounting arrangement shown in Fig. 1a), both by perspective representations and by lateral partial sectional representations,

figures 8a) and 8b) different representations of a worm wheel shaft, and

FIG. 9 a separate illustration of a further embodiment of a bearing housing.

FIGS. 1a) to 1c) show an exemplary embodiment of a mounting arrangement 10 according to the invention for mounting a first embodiment of a worm wheel shaft 121 of a worm wheel planetary gear 14 (see FIG. 7). In figure 1a) the mounting arrangement 10 is shown by means of a perspective representation, while in figure 1b) the mounting arrangement 10 is shown by means of a side view, the mounting arrangement 10 being represented therein allowing to partially see the inside.

In both Fig. 1a) and Fig. 1b) the mounting arrangement 10 is shown in the unassembled state, while in Fig. 1c) it is shown in the assembled state.

The mounting arrangement 10 comprises the worm wheel shaft 121, which has a first end 16 and a second end 18. The worm wheel shaft 121 can be divided into a first section 20 and a second section 22, each having , a substantially cylindrical shape. The first section 20 has a first diameter D1 and the second section 22 has a second diameter D2, the first diameter D1 being greater than the second diameter D2. In this regard, the first section 20 forms the first end 16, while the second section 22 forms the second end 18.

Furthermore, the worm wheel shaft 121 has a worm wheel toothing 24, which is arranged on the second section 22 and part of the second end 18.

In addition, the mounting arrangement 10 comprises an axial and radial bearing 26, which in the illustrated embodiment is designed as a roller bearing 28, in this case as a ball bearing 30. The axial and radial bearing 26 forms a first bearing section. mounting 32 to mount the worm wheel shaft 121.

Furthermore, the mounting arrangement 10 comprises a planet carrier 34, on which three planet wheels 36 are rotatably mounted about in each case a planet wheel axis AP. The planetary gears 36 have a planetary gear toothing 38, which is matched to the worm gear toothing 24 of the worm wheel shaft 121. The planet gear toothing 38 forms a second mounting section 40 for mounting the worm wheel shaft 121.

As is evident in particular from Fig. 1c), the worm wheel shaft 121 is inserted with its first section 20 into the axial and radial bearing 26 so that radially and axially acting forces can be transmitted by the shaft. worm wheel 121 to the axial and radial bearing 26. For this, the worm wheel shaft 121 can be compressed with the first section 20 in the axial and radial bearing 26. Furthermore, the worm wheel shaft 121 is inserted with the worm gear worm gear 24 on the second mounting section 40 so that the planet gear toothing 38 of the planet gears 36 is in mesh with the gear toothing 24. Accordingly, the gear shaft 121 is rotatably mounted about a AS worm wheel shaft. It should be noted that the worm gear axes AP of the gear wheels 36 run at an angle relative to the worm gear shaft axis AS, as can be seen in particular from FIG. 1c).

It further follows from FIG. 1c) that the second end 18 of the worm wheel shaft 121 in the assembled state does not protrude axially beyond the planet wheels 36, but is enclosed in sections by the worm wheel planet wheels 36. Furthermore, from figure 1c) it is clear that the first mounting section 32 is arranged outside the planet carrier 34. Thus, the compression of the worm wheel shaft 121 in the axial and radial bearing 26 can also take place outside the planet carrier. planet carrier 34, which simplifies assembly.

Different process steps for producing a motor gear arrangement 42 as proposed are shown in FIGS. 2 to 7, which has the planetary worm gear 14 with the mounting arrangement 10 shown in FIGS. 1a) to 1c).

Starting from figure 1a), first of all, the worm wheel shaft 121 with its first section 20 is compressed in the axial and radial bearing 26, so that the configuration shown in figure 2 is obtained. The axial and radial bearing 26 shown in the exemplary embodiment as ball bearing 30 has an outer ring 46 and an inner ring 48.

Subsequently, the axial and radial bearing 26 is inserted into a bearing housing 44, as can be recognized from FIG. 3. The inner ring 48 is connected to the first section 20 of the worm wheel shaft 121. The bearing housing Bearing 44 has a cavity 50, the diameter of which corresponds approximately to the external diameter of the external ring 46. The external diameter of the external ring 46 may have a certain oversize with respect to the diameter of the cavity 50, so that the external ring 46 can be fixed by means of a frictional drive in the cavity 50. Further, the outer ring 46 is supported in the axial direction in the cavity 50 in the bearing housing 44, so that the axial and radial bearing 26 is fixed in an axial direction.

Subsequently, the bearing housing 44 is connected to an electric motor 52 in a non-rotating manner, as can be seen from FIG. 4. In particular, it can be seen from FIG. 3 that the bearing housing 44 has a number of projections 54, which engage in corresponding recesses 56 of the electric motor 52 and thus prevent the bearing housing 44 from twisting with respect to the electric motor 52. For axial securing of the bearing housing 44 with respect to the electric motor 52 , the projections 54 can have a certain oversize relative to the notches 56, so that a frictional drive is generated. Alternatively or cumulatively, the bearing housing 44 can also be glued, be bolted or welded to the electric motor 52.

The electric motor 52 has a motor shaft 58, which protrudes from the electric motor 52. The worm wheel shaft 121 forms a motor shaft mount 59, with which the motor shaft 58 engages when connecting the bearing mount 44. with the electric motor 52. The cross sections of the motor shaft 58 and the motor shaft mount 59 are selected such that a torque can be transmitted. For this, the cross sections can be configured, for example, quadratically or hexagonally.

In FIG. 5, the planet carrier 34 shown in FIGS. 1a) to 1c) can be seen, which is now inserted into an internal worm wheel 60, which has an internal toothing 62, which is matched to the planet gear toothing 38. As can be seen From Figure 6, a spacer washer 64 is inserted into the inner worm wheel 60 and bears axially on the inner worm wheel 60, after the planet carrier 34 has been inserted into the inner worm wheel 60 so that the gear toothing 38 is in mesh with the internal toothing 62 of the internal worm wheel 60.

The inner worm wheel 60 has an annular collar 66, with which the inner worm wheel 60 is pushed onto a correspondingly shaped shoulder 68 of the bearing housing 44. At the same time, the worm gear toothing 24 engages with the gear toothing satellite 38. In this case, the ball bearing 30 is supported with the outer ring 46 on the spacer washer 64, so that the ball bearing 30 is supported axially on one side in the bearing housing 44 and, on the other hand, on the spacer washer 64 and is therefore axially secured.

To join the inner worm wheel 60 and bearing housing 44 together, the inner worm wheel 60 and bearing housing 44 are welded together, for example, by laser beam welding. The motor gear arrangement 42 is now fully assembled. The inner worm wheel 60 is non-rotatably fastened to the bearing housing 44, which is in turn non-rotatably connected to the electric motor 52.

The worm wheel planetary gear 14 is formed by the worm wheel shaft 121, the planet carrier 34, the worm wheel planet wheels 36 and the inner worm wheel 60. Since the inner worm wheel 60 is resistant to rotation, the output has This takes place via a rotating planet carrier 34, which for this purpose has a drive element 70 for an output shaft (not shown).

In FIGS. 8a) and 8b), a second exemplary embodiment of the worm wheel shaft 122 is shown in perspective or sectional representation. In the second exemplary embodiment, the worm wheel toothing 24 does not extend to the second end 18 of the worm wheel shaft 122, but rather the worm wheel toothing 24 forms a free end 72. Between the free end 72 and the second Arranged at the end 18 of the worm wheel shaft 122 is a cylindrical section 74, in which an axially running bore 76 is arranged. the cylindrical section 74.

Although with reference to FIG. 7 a spacer washer 64 is provided for mounting, this spacer 64 can also be omitted if the bearing housing 44 - as shown in FIG. , 44a, and this surrounding rim surrounds the ball bearing 30 at least on its outer ring 46.

A further exemplary embodiment of a bearing housing is shown in FIG. 9 in sectional representation, which substantially corresponds to the sectional representation of FIG. 3. In contrast to the representation shown in FIG. 3, the bearing housing 44 is injected around the axial and radial bearing 26. Accordingly, by injecting the bearing housing 44, a unit is created from the bearing housing 44 and the axial and radial bearing 26, thereby eliminating the assembly step of inserting the axial and radial bearing 26 in the bearing housing 44 and, therefore, the assembly is simplified. Furthermore, the use of the spacer washer 64 can be dispensed with, so that the number of components is reduced in this embodiment.

List of reference signs

10 mounting arrangement

12, 121, 122worm wheel shaft

14 worm wheel planetary gear

16 extreme first

18 second end

20 first section

22 second section

24 worm wheel toothing

26 axial and radial bearing

28 roller bearing

30 ball bearing

32 first mounting section

34 satellite carriers

36 satellite wheel

38 toothed satellite wheel

40 second mounting section

42 motor gear arrangement

44 bearing housing

46 outer ring

48 inner ring

50 cavity

52 electric motor

54 outgoing

56 undercut

58 engine shaft

59 motor shaft housing

60 internal worm wheel

62 internal toothing

64 spacer washer

66 necklace

68 highlight

70 drag element

72 free end

74 cylindrical section

76 drilling

AP satellite wheel axle

AS worm wheel shaft

D1 first diameter

D2 second diameter

D3 foot circumference diameter

D4 diameter of the cylindrical section

Claims (3)

1. Motor gear arrangement, in particular for an adjustment device in vehicles for adjusting two mutually adjustable vehicle parts, comprising - an electric motor (52) and - a worm wheel planetary gear (14) comprising a worm wheel shaft (12) with a worm wheel toothing (24), which is rotatably mounted about a worm wheel shaft axis (AS), a planet carrier (34) with at least three helical-wheel planet wheels (36), which are each rotatably mounted about a planet wheel axis (AP) on the planet carrier (34) and each have In this case, a planetary gear toothing (38), the worm gear axes (AP) running at an angle relative to the worm gear shaft axis (AS), an internal worm wheel (60) with an internal toothing (62), which is meshed with the planet gear toothing (38), and a mounting arrangement (10) for mounting the worm wheel shaft (12), having a first mounting section (32) and a second mounting section (40), the first mounting section (32) being arranged outside the planet carrier (34) and being formed by an axial and radial bearing (26) and the second mounting section (40) being formed by the worm wheel planet wheels (36), the planet gear toothing (38) on the second mounting section (40) being in mesh with the worm wheel toothing (24), - the electric motor (52) has a motor shaft (58), which is connected to the worm wheel shaft (12) in a non-rotating manner, and - the axial and radial bearing (26) being arranged in a bearing housing (44), which is arranged between the electric motor (52) and the internal worm wheel (60), characterized in that the bearing housing (44) is non-rotatably connected to the electric motor (52) and the inner worm wheel (60). Motor gear arrangement according to Claim 1, characterized in that the internal worm wheel (60) is connected to the electric motor (52) in a non-rotating manner. Method for producing a motor gear device according to one of claims 1 or 2, comprising the following steps: - providing a worm wheel shaft (12) with a first end (16), a second end (18) and a worm wheel toothing (24), - providing a first mounting section (32) by means of an axial and radial bearing (26), - arranging the axial and radial bearing (26) in a bearing housing (44), which is injected around the axial and radial bearing, - providing a planet carrier (34) with at least three worm wheel planet wheels (36), which are each rotatably mounted about a planet wheel axis (AP) on the planet carrier (34) and have in each case a planet gear (38), the worm gear axes (AP) running at an angle relative to the worm gear shaft axis (AS) and the planet gears (36) forming a second mounting section (40), - inserting the worm wheel shaft (12) into the first mounting section (32) with the first end (16), and - inserting the worm wheel shaft (12) into the second mounting section (40) with the second end (18) such that the planet gear toothing (38) is engaged in the second mounting section (40) with the worm wheel toothing (24).